package com.mjk.common.util;

import com.mjk.common.tools.logger.BizLogger;
import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

import java.lang.reflect.Field;
import java.sql.Ref;

public class AopTargetUtils {  
  
    private AopTargetUtils(){}
    /** 
     * 获取 目标对象 
     * @param proxy 代理对象
     */  
	public static Object getTarget(Object proxy) {
		try {
			if (!AopUtils.isAopProxy(proxy)) {
				return proxy;// 不是代理对象
			}

			if (AopUtils.isJdkDynamicProxy(proxy)) {
				return getJdkDynamicProxyTargetObject(proxy);
			} else { // cglib
				return getCglibProxyTargetObject(proxy);
			}
		} catch (Exception e) {
			BizLogger.error(e);
		}
		return null;
	}  
    
    private static Object getCglibProxyTargetObject(Object proxy) throws Exception {
        Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
        ReflectionUtils.setAccessible(h);
        Object dynamicAdvisedInterceptor = h.get(proxy);

        Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");
        ReflectionUtils.setAccessible(advised);
        return ((AdvisedSupport)advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();
    }  
  
  
    private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {
        Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
        ReflectionUtils.setAccessible(h);
        AopProxy aopProxy = (AopProxy) h.get(proxy);

        Field advised = aopProxy.getClass().getDeclaredField("advised");
        ReflectionUtils.setAccessible(advised);
        return ((AdvisedSupport)advised.get(aopProxy)).getTargetSource().getTarget();
    }  
      
}  